Answer: Blossom end rot is not a disease but a reaction to certain growing conditions. It often occurs when dry conditions follow a wet, rainy period, and the fruits are stressed by the change in water availability. To combat this problem, try to keep water availability consistent--if a dry spell follows rain, be sure to keep the plants well watered and mulch with a 4-6" layer of hay or straw to conserve moisture. A calcium deficiency in the soil can exacerbate the problem, so if you have not spread lime on your garden recently, you might want to test your soil to check calcium levels. Your Cooperative Extension Service may have information on soil testing.
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